Nut-tapping machine.



No. 812,422. PATEN'TED FEB. 13, 1906. J. J. HARRIS 6: A. A. PRIOR.

NUT TAPPING MACHINE.

APPLIOATION FILED APR.3, 1905.

lfl 4 SHEETS-SHEET 1.

No. 812,422. PATENTED FEB. 13, 1906. J. J. HARRIS & A. A. PRIOR.

NUT TAPPING MACHINE.

APPLICATION FILED APR, 3, 1905.

4 SHEETS-SHEET 2.

/. 9m fga, Allomey No. 812,422. PATENTED FEB. 13, 1906. J. J. HARRIS & A. A. PRIOR.

NUT TAPPING MACHINE.

APPLICATION FILED APR. 3, 1905.

TS-SHEET 3.

- ZZLZ 6/ W Mg Alforney No. 812,422. PATENTED FEB. 13, 1906. J. J. HARRIS & A. A. PRIOR- 4 SHEETS-SHEET 4.

NUT TAPPING MACHINE.

APPLIOATION FILED APR. 3, 1905.

s M m UNITED STATES PATENT ort on.

JESSE J. HARRIS, OF BEREA, AND ANDREW A. PRIOR, OF CLEVELAND,

OHIO, ASSIGNORS OHIO. i

or ONE-HALF TO THOMAS REID, or CLEVELAND,

NUT-TAPPIN G IVIACHINE.

Specification of Letters Patent.

Patented Feb. 13, 1906.

Application filed April 3, 1905. Serial Nb. 253,408.

To all whom it may concern.-

Be it known that we, J nssn J. HARRIS, residing at Berea, and ANDREW A; PRIOR, residing at Cleveland, in the county of Guyahoga and State of'Ohio, citizens of the United States, have invented new and useful Improvements in Nut-Tapping Machines, of which the following is a specification.

This invention is a nut-tapping machine of that class in which the tap is gripped atone end during the tapping operation, a, plurality of nuts being threaded by the tap and held on the shank thereof, and then the tap is gripped at the other end, the former grip be- I 5 ing released to allow the nuts to drop off of the tap. I

The machine is characterized particularly by improved means for lifting the tap from the lower grip or chuck for the purpose of let- 2o ting nuts drop therefrom and by'improved means for feeding and holding the nut-blanks to the tap. Other advantages of construction and operation will be apparent, however, from the following description. A

2' 5 In the accompanying drawings, Figure 1 is a front elevation of the machine. Fig. 2 is an elevation of one side, and Fig. 3 is an elevation of the other side. Figs. 4 and 4 represent asectional elevation on the line 4 4 of Fig.

0 1. Fig. 5 is a detail in section showing the mechanism for feeding the blanks to the tap. Fig. 6 is a plan of the trigger of said mechanism. Fig. 7 is a plan view of the upper grip or jaws for holding the-tap while the nuts 3 5 drop off. Fig. 8 is a plan view of the tap.

Fig. 9 is a top plan view of the machine.

The machine comprises mechanical parts mounted upon a suitable frame, (indicated at 50,) the machine being of the vertical type that is, with the tap-disposed vertically. The

main shaft is indicatedat A, geared by bevelgears 12 and 12 to a sleeve 15, supported by a bearing-bracket 15, depending from the main frame. The sleeve carries a chuck 13,

having a squared socket to receive the square end 10 of the tap 10. A cap 14 fits over the chuck and is screwed onto the upper end of the sleeve 15. Within the sleeve 15 is a plunger 17, which rests upon a cam 16, having a notch 16. Whenthe plunger rides upon the plain surface 16 of the cam, it is pressed up so that its upper end presses the jaws 13 into tight contact with the cap' 14, binding the tap therein. When the plunger 17 drops in the recess 16*, the chuck 13 is released, and atthis instant the upper'gripping-jawSlS take hold of the upper end of the tap by means to be hereinafter described.

' The cam 16 is mounted upon a shaft V, rotated by worm-gearing at I, with a shaft G, having worm-gearing H with the main shaft A. X indicates a plunger which works through suitable guides 51 on the frame of the machine and has therein a cushioned block 90, connected by astud y to pitman Y, connected to a crank N on the crank-shaft K, which is rotated by bevel-gearing L and .M, shaft W,"and worm-gearing J on the main shaft A. This effects the reciprocation of the compression-block and blank-holder 7 at the lower end of the plunger X. Y

1" indicates a hopperor scoop in which the nut-blanks are placed and from which they are fed through the operation of a cam 2, whichis rotated by sprocket-chain 2 from the shaft K. This cam raises and lowers a plunger 3, which lifts the blanks in the hopper, so that they slide down a groove-4 into an inclined chute 5, which delivers them flatwise onto a table 6. A slide 6 works across this table and acts to deliver the nuts into the recess of the holder 7. The advancing slide pushes each nut onto a trigger 8, which is forked at the front, as at 8 with the pilot 10 of the tap projecting between'the forks. The trigger 8 is pivoted at 11 and is normally held up by a flat spring 9. 'After each block is shoved into place upon the forks 8 the block 7 descends, forcing the blank over the tap 10. In forcing the nut down on the tap the trigger 8 swings down toward'the vertical, allowingthe nut to pass over the threaded portion of the tap, and thence down the stem of the tap, after which the trigger swings up for the'next operation.

The slide 6 is connected to a bell-crank lever S and is normally pressed in by springs. The lower arm of the bell-crank lever rests upon the upper arm of a pawllever'R, the lower arm of which rests upon a ratchet-cam 24, mounted on the cam-shaft V. This cam has teeth corresponding in number to the number of nuts which the tap willrec'eive before' being dumped. Each notch in the cam 24 allows the pawl R to drop and the spring 8 to advance the slide 6 and feed one blank to the tap. When the full number of nuts is fed, the blank 24 on cam 24 holds up the pawl R and prevents any further feed until the tap is emptied. At the same instant the tap is gripped at the top and held during one stroke of the plunger X to allow the nuts to drop off by the means now to be described.

22 indicates a rod having an arm 22 fixed thereto, and'this arm carries depending rods 20, which work in recesses in the block 7, and the lower ends thereof are beveled, as at 20*, to engage behind beveled slides 19, which slide horizontally in recesses formed in the block 7 and operate aws 18, arranged to grip the tap 10 when the rods 20 are depressed and the slides 19 advanced. Springs 19 are interposed to cushion the grip of the jaws 18. These jaws are supported and guided by rods 18 having thereon coiled springs 18 which serve to retract the jaws when the slides 19 are released. At its lower end the rod 22 has a hole 23 arranged to receive the end of a pin 21, which is thrust therein by a side-wipe cam 26, mounted on the shaft V. A spring 21 retracts the pin after the cam passes. The rod 22 works up and down with the plunger X. The cam 26 is so positioned that when the feed is stopped by means of the blank 24 the pin is advanced and forced into the hole 23. This holds down the rod 22 and the arm 22 so that on the next lift of the plunger X the beveled ends 20 of the rods are forced behind the slides 19, causing the jaws 18 to grip the tap. At the same instant the chuck 13 is released by operation of the plunger 17 and notch 16 and when the tap lifts the nuts drop off the lower end thereof. At the next downstroke of the plunger the shank of the tap is inserted in the chuck 13 and is gripped therein by the lift of the plunger 17. At the same time the cam 26 passes the pin 21 and its spring 21 retracts it, releasing the rod 22. This permits the springs 27, coiled around the rods 20, to lift said rods, allowing the springs 18 to retract the jaws 18 and release the tap for the next series of operations.

What we claim as new, and desire to secure by Letters Patent, is

1. In a nut-tapping machine, the combination with a tap having an extended shank to receive a plurality of nuts passed over the tap, of a chuck normally engaging the end of the shank, a shaft having a notched cam thereon, a plunger which supports the chuck 1 and is supported on the cam and adapted to drop into the notch and release the chuck during one of a series of strokes, a reciprocating blank-holder arranged to force blanks over the tap and onto the shank, and having jaws operating to grip the tap at its front end when the chuck is released, feed mechanism 3. In a nut-tapping machine, the combination with a tap and a reciprocating nut-blank holder, of a feed-table having at the end a pivoted blank-support having a forked end projecting between the tap and the holder and in the way of the latter, and constructed to support a blank over the point of the tap and to swing out of the way of the holder as it advances.

4. In a nut-tapping machine, thehombination with the tap, and the reciprocating holder arranged for forcing blanks thereon, of the feed-table having at the end a swinging blanksupport projecting between the tap and holder and arranged to yield when the holder advances, and the slide upon the table, for feeding blanks onto said support.

5. In a nut-tapping machine, the combination with a tap, of a reciprocating tubular plunger having a blank-holder at the end, a block in said plunger, springs between said block and the ends of the plunger, and a crank connected to said block.

6. In a nut-tapping machine, the combination with a reciprocating blank-holder constructed to force blanks over a tap, of feed mechanism feeding blanks to the holder, means to arrest the feed during one of a series of strokes, and means to simultaneously strip the nuts from the tap.

7. In a nut-tapping machine, the combination of a tap, means to support and rotate the same, a plunger having a blank-holder constructed to force nuts onto thetap, aws

carried by the plunger and arranged to'grip the tap, rods normally slidable with the plunger and having a connection with the jaws, to close the same when the movement of the rods isstopped, and means to stop the movement]. of the rods at predetermined times.

In testimony whereof we have signed our names to this specification 1n the presence of two subscribing witnesses.

JESSE J. HARRIS. ANDREW A. PRIOR.

Witnesses:

JOHN A. BOMMHARDT, LOTTIE NEWBURN. 

